I've got a website that has users and users can add each other as friends. Lately, I've been seeing a lot of web apps that have a function where you can import your friends from Facebook directly into their web app. How is this type of import of the Facebook friend list implemented?
I looked in the Facebook API docs, and can't really find anything directly on point to this.
Presumably I would use the Facebook API to pull a list of the user's friends. From there, how would I then find users on my site that are members of that list? Does this type of scheme only work with other users that have already used the Facebook friend search themselves, so that you can tie a Facebook account to them?
There really doesn't seem to be much out there on this topic, even though I've seen a lot of sites doing it, so any help, no matter how basic, would be much appreciated.